Yes, this is true. The reason why they are stronger is because you are infusing it with your own energies. When you make your own spell or ritual, try to make it along the lines of others. e.g: Dont decide to rap instead of chant because thats disrespectful and wont work as well.

They have to be created from your heart. Yes, you could just make it up on the spot, but once again, it id more powerful if you spend your time thinking it out.

This is a very useful website to use: http://www.llewellyn.com/journal/article/1864

I know that many here write their own spells which is wonderful. But I also know that many of you are just starting out and may have no experience in how to create a spell for a specific purpose you might have. I found some great websites that I think you'll find helpful in learning how to create spells for your own specific purpose that are likely to work for you.

Some of these are very Wiccan or Pagan in viewpoint so if that doesn't work for you we can talk about how you could change the spell to fit your spiritual viewpoint.